Soun Mbr - Kushiro (Eocene of Japan)

Where: Japan (43.0° N, 144.4° E: paleocoordinates 45.3° N, 140.8° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Soun Mudstone Member (Teshibetsu Formation), Late/Upper Eocene (37.2 - 33.9 Ma)

• STRATIGRAPHIC RELATIONS: From Soun coal-bearing member of the Teshibetsu Fm, Urahoro Gp (Middle Eocene) and underlies the Soun coal-bearing mbr and overlies the Yubetsu coal-bearing Mbr. THICKNESS: From unit which reaches a thickness of 30-40 m. AGE: Late Eocene based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: Composite checklist for unit from local area.

• member-level stratigraphic resolution

Environment/lithology: marginal marine; lithified siliciclastic sediments

• ENVIRONMENT: Brackish and fluvial faunal assemblage.
• SPECIFIC LITHOLOGY: Unknown lithology. LITHIFICATION: Assume to be lithified on the basis of age.

Size class: macrofossils

Collection methods: COLLECTOR: T. Mizuno and Hyakkoku (c. 1960). REPOSITORY: Unknown, not stated in text.

Primary reference: A. Mizuno. 1964. Summary of the Paleogene molluscan faunas in North Japan. Geological Survey of Japan Report 207 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 71046: authorized by Austin Hendy, entered by Austin Hendy on 15.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Only includes characteristic bivalvia and gastropoda. NOMENCLATURE: Somewhat antiquated, but with species-level identifications.
Show authors, comments, and common names
unclassified
  -
Semisulcospira fiscina
Semisulcospira fiscina
SUBSPECIES: S. fiscina yokoyamai
Gastropoda
 Cerithioidea - Potamididae
Cerithidea ishikariensis
Bivalvia
 Ostreida - Ostreidae
Ostrea eorivularis
Ostrea eorivularis Oyama and Mizuno 1958 oyster
 Cardiida - Corbiculidae
Corbicula sitakaraensis